来源：http://www.ido321.com/882.html
3、PHP对图像的裁剪
1: <div>
2: <h4>裁剪之前</h4>
3: <img src="1.png" style="border:1px solid red;">
4: </div>
5: <?php
6: header("content-type","text/html;charset=utf-8");
7:
8: /*
9: *图片裁剪
10: *@param string $filename 图片的url
11: *@param int $width 图片裁剪宽度
12: *@param int $height 图片裁剪高度
13: *@param int $x 裁剪图片左边开始的位置
14: *@param int $y 裁剪图片顶边开始的位置
15: */
16: function cut($filename,$x,$y,$width,$height)
17: {
18: /*获取图像资源，需要裁剪的图片*/
19: $image = imagecreatefrompng($filename);
20:
21: /*以新的大小创建画布，保存裁剪后的图片*/
22: $image_p = imagecreatetruecolor($width, $height);
23:
24: /*使用imagecopyresampled缩放*/
25: imagecopyresampled($image_p, $image, 0, 0, $x, $y, $width, $height, $width, $height);
26:
27: /*保存裁剪后的图片和命名*/
28: imagepng($image_p,'test1.png');
29:
30: /*释放资源*/
31: imagedestroy($image_p);
32: imagedestroy($image);
33: }
34: /*调用函数*/
35: cut('1.png',20,20,80,80);
36: ?>
37: <div>
38: <h4>裁剪之后</h4>
39: <img src="test1.png" style="border:1px solid red;">
40: </div>
效果
4、PHP为图像添加水印
1: <div>
2: <h4>没有水印</h4>
3: <img src="1.png" style="border:1px solid red;">
4: </div>
5: <?php
6: header("content-type","text/html;charset=utf-8");
7:
8: /*
9: *给背景图片添加水印,背景图片格式png,水印格式gif
10: *@param string $filename 图片的url
11: *@param string $water 水印图片
12: */
13: function watermark($filename,$water)
14: {
15: /*获取原图的大小*/
16: list($b_w,$b_h) = getimagesize($filename);
17:
18: /*获取水印图片的大小*/
19: list($w_w,$w_h) = getimagesize($water);
20:
21: /*在背景图片中放水印图片的随机起始位置*/
22: $posX =rand(0,($b_w - $w_w));
23: $posY =rand(0,($b_h - $w_h));
24:
25: /*获取图像资源，需要裁剪的图片*/
26: $back = imagecreatefrompng($filename);
27: $water = imagecreatefromgif($water);
28:
29: /*使用Inagecopy函数复制水印图片到指定位置*/
30: imagecopy($back, $water, $posX, $posY, 0, 0, $w_w, $w_h);
31:
32: /*保存带水印的图片和命名*/
33: imagepng($back,'test2.png');
34:
35: /*释放资源*/
36: imagedestroy($back);
37: imagedestroy($water);
38: }
39: /*调用函数*/
40: watermark('1.png','test.gif');
41: ?>
42: <div>
43: <h4>加上水印</h4>
44: <img src="test2.png" style="border:1px solid red;">
45: </div>
效果
